Why is it not used again and wouldn’t it be very efficient to combine with a heat pump for reuse?
Especially since water from shower or sink isn’t usually very dirty, couldn’t it be stored for a while in an isolated tank so that e.g. a heat pump can run more efficient on it than on usually colder air or colder ground water?
In: Engineering
A friend works in… water stuff. Apparently it’s not done, at least where I live, because of biological reasons. There’s a certain kind of biological process that happens in the sewer network that’s essential for waste water treatment. Water in the system is expected to be within a certain temperature range and, if we were to pump all the heat out of it and have 4°C water in the pipes, waste treatment just wouldn’t work.
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